Add tests with DOM in Jenkinsfile

Jenkinsfile

@@ -30,10 +30,22 @@ pipeline {
 					# export MAVEN_OPTS="-Xmx2G"
 					
 					mvn clean install -f org.eclipse.jdt.core.compiler.batch -DlocalEcjVersion=99.99 -Dmaven.repo.local=$WORKSPACE/.m2/repository -DcompilerBaselineMode=disable -DcompilerBaselineReplace=none
+
+					# Build and test without DOM-first to ensure no regression takes place
+					mvn -U clean verify --batch-mode --fail-at-end -Dmaven.repo.local=$WORKSPACE/.m2/repository \
+						-Ptest-on-javase-21 -Pbree-libs -Papi-check -Pjavadoc \
+						-Dcompare-version-with-baselines.skip=false \
+						-Djava.io.tmpdir=$WORKSPACE/tmp -Dproject.build.sourceEncoding=UTF-8 \
+						-Dtycho.surefire.argLine="--add-modules ALL-SYSTEM -Dcompliance=1.8,11,17,20,21 -Djdt.performance.asserts=disabled" \
+						-DDetectVMInstallationsJob.disabled=true \
+						-Dtycho.apitools.debug \
+						-Dcbi-ecj-version=99.99
 					
+					# Then enable DOM-first
+					sed -i 's|</argLine>| -DCompilationUnit.DOM_BASED_OPERATIONS=true -DSourceIndexer.DOM_BASED_INDEXER=false -DICompilationUnitResolver=org.eclipse.jdt.core.dom.JavacCompilationUnitResolver -DAbstractImageBuilder.compiler=org.eclipse.jdt.internal.javac.JavacCompiler_</argLine>|g' */pom.xml
+					# and build/run it
 					mvn -U clean verify --batch-mode --fail-at-end -Dmaven.repo.local=$WORKSPACE/.m2/repository \
 						-Ptest-on-javase-21 -Pbree-libs -Papi-check -Pjavadoc \
-						-Dmaven.test.failure.ignore=true \
 						-Dcompare-version-with-baselines.skip=false \
 						-Djava.io.tmpdir=$WORKSPACE/tmp -Dproject.build.sourceEncoding=UTF-8 \
 						-Dtycho.surefire.argLine="--add-modules ALL-SYSTEM -Dcompliance=1.8,11,17,20,21 -Djdt.performance.asserts=disabled" \